/*
 * Copyright 2009 Cedric Priscal
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android_serialport_api;

import android.util.Log;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class SerialPort
{
    private static final String TAG = "SerialPort";

    /*
     * Do not remove or rename the field mFd: it is used by native method close();
     */
    private FileDescriptor mFd;
    private FileInputStream mFileInputStream;
    private FileOutputStream mFileOutputStream;
    private  File _device;

    public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException
    {
        /* Check access permission */
        /* Missing read/write permission, trying to chmod the file */
	/*	if (!device.canRead() || !device.canWrite())
		{
			try
			{

				Process su;
				su = Runtime.getRuntime().exec("/system/bin/su");
				String cmd = "chmod 777 " + device.getAbsolutePath() + "\n"
						+ "exit\n";
				su.getOutputStream().write(cmd.getBytes());

				if ((su.waitFor() != 0) || !device.canRead() || !device.canWrite())
				{
					throw new SecurityException();
				}
			}
			catch (Exception e)
			{
				e.printStackTrace();
				throw new SecurityException();
			}
		}*/

        mFd = open(device.getAbsolutePath(), baudrate, flags);

        if (mFd == null)
        {
            Log.e(TAG, "native open returns null");
            throw new IOException();
        }
        _device=device;

        mFileInputStream = new FileInputStream(mFd);
        mFileOutputStream = new FileOutputStream(mFd);
    }

    // Getters and setters
    public FileInputStream getInputStream()
    {
        return mFileInputStream;
    }

    public OutputStream getOutputStream()
    {
        return mFileOutputStream;
    }



    // JNI
    private native static FileDescriptor open(String path, int baudrate, int flags);
    public native void close();

    static
    {
        System.loadLibrary("serial_port");
    }
}
